# US 10,118,372 B2 · Laminate comprising polyolefin elastic film layer

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- Number: US 10,118,372 B2
- Document ID: US10118372B2
- Status: Granted
- Kind: B2
- Application number: 14/723,585
- Filed: 2015-05-28
- Published: 2015-12-10
- Granted: 2018-11-06
- Earliest claimed: 2014-06-05
- Assignees: The Procter & Gamble Company
- Applicants: The Procter & Gamble Company
- Inventors: Urmish Popatlal Dalal; Ray Dennis Dria; David Harry Melik; Keith Richard Coburn
- Web page: https://patentgrep.com/patent/US10118372B2

## CPC

- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 5/022: {Non-woven fabric}
- B32B 27/12: next to a fibrous or filamentary layer
- B32B 2262/12: Conjugate fibres, e.g. core/sheath or side-by-side
- B32B 2305/20: in the form of a non-woven mat
- B32B 2305/28: in the form of a mat
- B32B 2307/51: Elastic
- B32B 2307/718: Weight, e.g. weight per square meter
- B32B 2307/726: Permeability to liquids, absorption
- B32B 2437/00: Clothing
- B32B 2555/02: Diapers or napkins
- Y10T 428/273: of coating
- Y10T 428/31938: Polymer of monoethylenically unsaturated hydrocarbon
- Y10T 442/601: Nonwoven fabric has an elastic quality
- Y10T 442/637: Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
- Y10T 442/678: Olefin polymer or copolymer sheet or film [e.g., polypropylene, polyethylene, ethylene-butylene copolymer, etc.]
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed is a laminate comprising at least one polyolefin elastic film layer and at least one substrate layer; the polyolefin elastic film having the following properties: (1) an average integrated enthalpy sum of no greater than 17 J/g, preferably between about 5-17 J/g, according to the Thermal Analysis Method defined herein; (2) an average integrated enthalpy ratio of from 0.6 to 300, preferably 0.8 to 300, still preferably 1.0 to 300, according to the Thermal Analysis Method defined herein; and (3) an unload stress at 75% strain of above 0.8 MPa according to the Hysteresis Test defined herein; and wherein the laminate has a normalized load force/normalized unload force ratio at 75% strain of 1 to 2.6 according to the Hysteresis Test defined herein.

## Claims

### Claim 1

A trilaminate comprising one polyolefin elastic film layer and two substrate layers;
the polyolefin elastic film having the following properties:
(1) an average integrated enthalpy sum of no greater than 17 J/g, according to the Thermal Analysis Method defined herein;
(2) an average integrated enthalpy ratio of from 0.6 to 300, according to the Thermal Analysis Method defined herein; and
(3) an unload stress at 75% strain of above 0.8 MPa according to the Hysteresis Test defined herein; and
wherein the trilaminate has a normalized load force/normalized unload force ratio at 75% strain of 1 to 2.6 according to the Hysteresis Test defined herein;
wherein the polyolefin elastic film layer comprises a first polyolefin elastomer, a second polyolefin elastomer, and a third polyolefin elastomer;
wherein the first polyolefin elastomer comprises a blend of two random propylene-ethylene copolymers and has an overall crystallinity of about 6 wt %;
wherein the second polyolefin elastomer comprises random copolymers of propylene with ethylene and has a glass transition temperature of about −40° C.;
wherein the third polyolefin elastomer comprises random copolymers of propylene with ethylene and has a glass transition temperature of about −40° C.;
wherein the second polyolefin elastomer is different than the third polyolefin elastomer; and
wherein the two substrate layers are two nonwoven layers.

### Claim 2 (depends on 1)

The trilaminate of claim 1 having a normalized unload force at 75% strain of above 0.25 N/cm according to the Hysteresis Test defined herein.

### Claim 3 (depends on 1)

The trilaminate of claim 1 having a normalized force at break of at least 3.4 N/cm according to the Tensile Test defined herein.

### Claim 4 (depends on 1)

The trilaminate of claim 1 having a % strain at break of at least 500% according to the Tensile Test defined herein.

### Claim 5 (depends on 1)

The trilaminate of claim 1 which exhibits two peaks according to the Tensile Test defined herein.

### Claim 6 (depends on 1)

The trilaminate of claim 1 which exhibits a peak at lower than 300% strain according to the Tensile Test defined herein.

### Claim 7 (depends on 1)

The trilaminate of claim 1 wherein the two nonwoven layers are extensible.

### Claim 8 (depends on 1)

The trilaminate of claim 1 wherein the two nonwoven layers are made of bicomponent fibers.

### Claim 9 (depends on 1)

The trilaminate of claim 1 wherein the polyolefin elastic film layer has a basis weight of from about 5 to about 150 g/m2.

### Claim 10 (depends on 1)

The trilaminate of claim 1 wherein the trilaminate is incrementally stretched.

### Claim 11 (depends on 1)

A component for an absorbent article made of the trilaminate of claim 1, said component selected from the group consisting of waistbands, leg elastic, side panels, elastic belts, stretch outer cover, and stretch ears.

### Claim 12 (depends on 1)

The trilaminate of claim 1 wherein the polyolefin elastic film's average integrated enthalpy sum is between about 5-17 J/g.